Update notification settings

Update the organization's notification preferences. These are org-wide, so the change applies to every brand in the organization. All fields optional; only provided fields change. reportRecipients replaces the client-report recipient list (each entry: email + weekly/monthly/whiteLabel booleans + teamIds + an optional per-brand reports map + an optional schedule: sendTime, timeZone, weeklyDay, monthlyDay). defaultReportTemplateSlug sets the template used when a recipient has no per-brand choice. reportLinkPassword gates the hosted report links. weeklyReportTeamIds / monthlyAuditTeamIds scope the org's own reports to specific brands; omit or send null for all brands.